2 * Copyright (c) 1987, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93";
32 #endif /* LIBC_SCCS and not lint */
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include "namespace.h"
37 #include <sys/param.h>
46 #include "un-namespace.h"
48 char *_mktemp(char *);
50 static int _gettemp(char *, int *, int, int);
52 static const unsigned char padchar[] =
53 "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
56 mkstemps(char *path, int slen)
60 return (_gettemp(path, &fd, 0, slen) ? fd : -1);
68 return (_gettemp(path, &fd, 0, 0) ? fd : -1);
74 return (_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL);
80 return (_gettemp(path, (int *)NULL, 0, 0) ? path : (char *)NULL);
83 __warn_references(mktemp,
84 "warning: mktemp() possibly used unsafely; consider using mkstemp()");
89 return (_mktemp(path));
93 _gettemp(char *path, int *doopen, int domkdir, int slen)
95 char *start, *trv, *suffp, *carryp;
100 char carrybuf[MAXPATHLEN];
102 if ((doopen != NULL && domkdir) || slen < 0) {
107 for (trv = path; *trv != '\0'; ++trv)
109 if (trv - path >= MAXPATHLEN) {
110 errno = ENAMETOOLONG;
116 if (trv < path || NULL != strchr(suffp, '/')) {
121 /* Fill space with random characters */
122 while (trv >= path && *trv == 'X') {
123 rand = arc4random_uniform(sizeof(padchar) - 1);
124 *trv-- = padchar[rand];
128 /* save first combination of random characters */
129 memcpy(carrybuf, start, suffp - start);
132 * check the target directory.
134 if (doopen != NULL || domkdir) {
135 for (; trv > path; --trv) {
138 rval = stat(path, &sbuf);
142 if (!S_ISDIR(sbuf.st_mode)) {
154 _open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
158 } else if (domkdir) {
159 if (mkdir(path, 0700) == 0)
163 } else if (lstat(path, &sbuf))
164 return (errno == ENOENT);
166 /* If we have a collision, cycle through the space of filenames */
167 for (trv = start, carryp = carrybuf;;) {
168 /* have we tried all possible permutations? */
170 return (0); /* yes - exit with EEXIST */
171 pad = strchr(padchar, *trv);
173 /* this should never happen */
177 /* increment character */
178 *trv = (*++pad == '\0') ? padchar[0] : *pad;
179 /* carry to next position? */
180 if (*trv == *carryp) {
181 /* increment position and loop */
185 /* try with new name */